I tried again to adjust the unit last night. The basic tension was set at a bit under 43 cm-N with a click type torque wrench. I tried to set the middle to 107 cm-N or so. I couldn't get the middle of the gear set that way. The ends of travel would go up. I think the middle of the gear is worn. I adjusted the gear so it is about even through out its travel. Probably about 75 cm-N. I'll give this a try. Probably in a few years, I'll by a rebuilt unit or get a used unit to rebuild.
Tom